I'd say NO.
Payments.
I haven't seen a case where paying for a tracker+insurance is less than just paying full insurance, generally seems to even out.
Insurance brokers you can work your payments down after time, tracker payments will inevitably go up.
Liability.
When I read the insurance contract it stated that I had to do tracker tests, had to make sure it was working etc etc etc. If the car got stolen and the tracker wasn't working then the insurance wouldn't pay this and that.
No tracker, no checks, no ways out for insurance.
Real case scenario.
Car get stolen with tracker, car gets recovered next day, I'm stuck with it and who knows what they did with it, how it was driven. Because it was stolen, it gets a CODE 3 status, you try sell or insure a CODE 3 vehicle and lots of people are going to laugh at you.
Cars get stolen without tracker, insurance pays or replaces with new car.